package io.pumelo.tools;


import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.security.MessageDigest;

public class Encrypt {




    public static String hmac_sha1(String value, String key) {
        try {
            // Get an hmac_sha1 key from the raw key bytes
            byte[] keyBytes = key.getBytes();
            SecretKeySpec signingKey = new SecretKeySpec(keyBytes, "HmacSHA1");

            // Get an hmac_sha1 Mac instance and initialize with the signing key
            Mac mac = Mac.getInstance("HmacSHA1");
            mac.init(signingKey);

            // Compute the hmac on input data bytes
            byte[] rawHmac = mac.doFinal(value.getBytes());

            // Convert raw bytes to Hex
            String hexBytes = byte2hex(rawHmac);
            return hexBytes;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    private static String byte2hex(final byte[] b){
        String hs="";
        String stmp="";
        for (int n=0; n<b.length; n++){
            stmp=(Integer.toHexString(b[n] & 0xFF));
            if (stmp.length()==1) hs=hs+"0"+stmp;
            else hs=hs+stmp;
        }
        return hs;
    }

    private static String appendEqualSign(String s){
        int len = s.length();
        int appendNum = 8 - (int)(len/8);
        for (int n=0; n<appendNum; n++){
            s += "%3D";
        }
        return s;
    }

    public static String MD5(String s) {
        char hexDigits[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
        try {
            byte[] btInput = s.getBytes();
            // 获得MD5摘要算法的 MessageDigest 对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要
            mdInst.update(btInput);
            // 获得密文
            byte[] md = mdInst.digest();
            // 把密文转换成十六进制的字符串形式
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }


}
